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#941 |
Got Foam?
diyAudio Member
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Hi Byrtt,
This is really cool. Thank you for providing this to the community - I wonder if perhaps we should start a new thread for this over in Headphone Amps section? So the EQ magic takes a cheap headphone and makes it sound like a nicer cheap headphone? ![]()
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#942 |
diyAudio Member
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Hi xrk971,
Admit forgot to write sound was based on first impression they sound the same so lets see if that holds in long run and with more different ears on it, there is differences we know of if for example we zoom in on impedance curves it discover DT-880 is smoother than OB-1 so engineering for DT-880 probably focused there and took much more time and knowledge to get it improved in smaller acoustic resonances not taking place into final design, also nominal impedance will make a difference for PCA performance and level of boost at low end for HPS-5000 verse OB-1 is a lot more. HD-650 is then again smother in impedance than DT-880 so we probably in long run and for long time listening get some small improvements, but what do i know about this other that these EQ correction works fantastic for OB-1 plus HPS-5000 : ) will create a DT-880 correction so we get more ears and opinion if I'm right for sound in long run. Last edited by BYRTT; 12th July 2017 at 06:01 PM. |
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#943 |
diyAudio Member
Join Date: Apr 2017
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Quote:
could you explain how to create the correction curve for different headphones? I want to try correct my other headphones/earphones if possible thanks! |
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#944 |
diyAudio Member
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Sure babysupra, plan is tomorrow make DT-880 correction for xrk971 and thereafter will make guide in MS Publisher how response correction is created using free tools FPGraphTracer/REW/Rephase and try get guide converted and shared as pdf document.
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#945 |
Got Foam?
diyAudio Member
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I will take a guess here based on the graphing of REW. I think Byrtt digitizes the curves from Innerfidelity. Imports the curve for the headphone, then imports the Harman curve. They are loaded into REW where there is an EQ dialog. Then start tweaking PEQ's while watching the fit - manually adjust until the processed curve matches the target. Transfer those PEQ's into Jriver.
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XRKaudio https://www.etsy.com/shop/XRKAudio |
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#946 |
Got Foam?
diyAudio Member
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Byrtt beat me to it. Thanks for making the DT880 curve!
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#947 |
diyAudio Member
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Making me a PCA is also a big thanks.
About guessing its close, difference is EQ correction is done in Rephase because it has nearly unlimited banks of PEQs and more flexiable settings than into REW, for example REW shelving filters have no way to adjust Q, also Rephase can output a convolution file into various formats depending what box is used or one can simply copy numbers from filters set into some player software. Some can maybe do task in smarter way but its the software i learned to manage and they all free except i support some little donation from time to time because its great tools, more specific info tomorrow in a guide but until that here is headlines: 1. Capture grey curves from Innerfidelity pdf document with MS snipertool saved as png, then in MS paint draw a purple line in middle of those grey curves which should be the average response and save png file. 2. Trace that purple response curve in FPGraphTracer and save as frd file, also Harman curve is traced same way once for all and can be reused for every new set of head phones one like to correct in future. 3. In REW import those two curves and offsets head phones curve relative to Harman and zero dB point so as max of boost and cuts will be kind of symmetric in dB value hovering around zero dB line. Now at "ALL SPL" tab REW can do the math and create a difference curve between Harman curve and actual head phone curve picking math (A over B), and this new difference curve is exported as frd or txt file. 4. In Rephase above is imported and then inverted because smart thing is if this difference curve between Harman target curve or it could be another famous head phone curve say HD-650 with difference to own head phone curve is EQed visual flat in Rephase we have our filter correction numbers or can output a single convolution file. This is the step that takes most time puzzling with sweeping Q/dB/frq numbers up and down until visual curves resonances and deviation from flat start get good as possible looking, think this phase probably needs a bit of patience even one is good at it. |
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#948 | |
diyAudio Member
Join Date: Jan 2017
Location: Western NC
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Quote:
Is EQing still worthwhile? I think so. But I believe this is why you can't make any old pair of cans sing like a STAX. ![]() ---------------------- In other news, my new PCA is a BEAST! ![]() I upgraded pretty much everything for this build, so it is hard to nail down what is responsible for what, but I have a feeling the 64mA bias current is a big part of the "zing" factor. The new caps make a big difference too. As I mentioned, the PPS input caps really open up the treble going into the transistors. Right now I am running my amp with 25V 1000uF Panasonic FR on the output. These are clearly more detailed and neutral than the Nichicon KA I used last go round. No bypass--none needed! This thing has treble for days... The sound now is much faster and more "technical" than my first build. First one was warm and shined with jazz and acoustic music. This one is agile and transparent, and can handle anything without breaking a sweat. I just threw one of the most difficult reference tracks I have in my collection at it..."Letting Go" by BT, JES, and Fractal. It has everything from female vocals to bass drops to glitchy stop-and-go synth stabs to lightning speed 128th-note drum machine farts, lol. Listening to this mess with a pair of ATH-M50 cans, my impressions are: 1) Best bass I've ever heard out of a headphone 2) Detail is insanely good 3) Control! This thing may run hot to the touch, but the presentation is cool as a cucumber. It maintains its composure through even the most complex passages. Crystal clear, powerful, and engaging sound. ![]() ![]() ![]() |
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#949 | |
diyAudio Member
Join Date: Apr 2017
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Quote:
It's going to be nice to have my Monoprice 8323 and Koss KSC75 sounding like HD650 huehuehue Which makes me wonder if the bass roll off in KSC75 is hardware limitation or due to tuning, because i like me some bass hahaha |
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#950 | ||
Got Foam?
diyAudio Member
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StellarE,
Sounds like you have yourself a killer rig. I have to try these Panasonic FR's and PPS caps. Quote:
![]() Thanks for the feedback. Quote:
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XRKaudio https://www.etsy.com/shop/XRKAudio Last edited by xrk971; 13th July 2017 at 04:11 AM. |
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